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The amount is denoted in USD so the markets would determine the amount of Storj which represents this.
The other main factors which would lead to the price :

  • amount of storage provided for use
  • The cost to store which decreases with advancements in technology
  • The network cost which will fall as the network grows
  • The security of the network, which increase with growth and further distribution

As far as I know there are no limitations on the network size so long as the services provided to assist operation and payment are at a scale to meet demand at the time.